The premiums for 2018 Marketplace plans were recently released to give consumers a chance to look at their plan options before open enrollment begins on November 1. Premiums are rising significantly in many counties across the country, in part due to the decision of the Trump Administration to cease payments to insurers for cost-sharing reductions. Insurer participation also declined in many areas, leaving more counties with only one insurer, which likely contributed to the high rate of premium growth.